Check out the SKHS Senior Project site for additional info.
Since your paper must be related to your project, you should already have a general topic in mind. Remember, your paper topic does not have to be exactly the same as your project, but it should be related. For example, just because you have chosen to make a surfboard for your project does not mean that you have to write your paper about surfboard construction, or even surfboards. Instead, surfing can be your topic.
Use this guide from URI's Library to get started in narrowing your topic and writing a research question
The public library has a wealth of resources that will be very useful to you as you conduct research for your senior paper. Once you have one, you will be able to access the catalog here